Un-ignited and ignited high pressure hydrogen releases: Concentration – turbulence mapping and overpressure effects. (July 2015)

• Record Type: Journal Article
• Authors: Daubech, Jérôme; Hebrard, Jérôme; Jallais, Simon; Vyazmina, Elena; Jamois, Didier; Verbecke, Franck
• Is Part Of: Journal of loss prevention in the process industries. Volume 36(2015:Jul.)
• Page Start: 439
• Page End: 446
• Publication Date: 2015-07
• Subjects: Delayed explosions -- Turbulence -- High pressure jet explosion -- Flame behaviour; Chemical industries -- Safety measures -- Periodicals; 660.2804
• DOI: 10.1016/j.jlp.2015.05.013
• Languages: English
• ISSNs: 0950-4230

Abstract

Abstract: Safety studies for production and use of hydrogen reveal the importance of accurate prediction of the overpressure effects generated by delayed explosions of accidental high pressure hydrogen releases. Analysis of previous experimental work demonstrates the lack of measurements of turbulent intensities and lengthscales in the flammable envelope as well as the scarceness of accurate experimental data for explosion overpressures and flame speeds. AIR LIQUIDE, AREVA STOCKAGE ENERGIE and INERIS join in a collaborative project to study un-ignited and ignited high pressure releases of hydrogen. The purpose of this work is to map hydrogen flammable envelopes in terms of concentration, velocity and turbulence, and to characterize the flame behaviour and the associated overpressure. These experimental results (dispersion and explosion) are also compared with blind FLACS modelling. Highlights: The objective is to provide additional data about high pressure hydrogen jet explosion. The initial pressure is 40 bar and the nozzle diameter is 12 mm. The tests are split in two phases: measurement of flow field characteristics in free jet and explosion tests. The explosion overpressure was measured at different locations. It was attempted to compare all the results to FLACS modelling.